CROSS-REFERENCE TO RELATED APPLICATIONS
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present general inventive concept relates to a display apparatus and a control
method thereof, and more particularly, to a display apparatus and a control method
thereof which differentially processes a video signal according to the type of an
external video device.
Description of the Related Art
[0003] Generally, a display apparatus receives a video signal from an external video signal
source and displays the received video signal on a display part.
[0004] Recently, various kinds of external video signal sources connected with a single
display apparatus have been developed. Also, the type of the video signal supplied
to the display apparatus varies according to the type of the external video signal
source.
[0005] For example, when the external video signal source comprises a PC, a still image
is usually supplied to the display apparatus. When the external video signal source
comprises a DVD player, a moving picture is usually supplied to the display apparatus.
Accordingly, the display apparatus needs to process the video signal for both the
moving picture and the still image.
[0006] In the case of the DVD player, since the video signal is output to the display apparatus
with a higher picture quality than the PC, the display apparatus needs to process
the video signal differentially according to the video signal source. The video signal
supplied from the DVD player is mainly a movie that is displayed on a part of or on
the whole display part. Meanwhile, the video signal supplied from the PC is processed
to be displayed as the whole display picture including an area containing a start
button and a task bar.
[0007] Therefore, there is an increasing need for the display apparatus to process the supplied
video signal according to the type of the external video signal source.
[0008] Under such circumstances, conventional display apparatuses may not determine the
type of the external video signal source when a plurality of external video signals
are input through the same connection part, such as a DVI connector. If possible,
the conventional display apparatuses determine the type of the external video signal
source according to detected formats of horizontal/vertical synchronous signals of
the video signal supplied from the external video signal source. Recently, however,
the formats of the horizontal/vertical synchronous signals of the video signal supplied
from the external video signal source have been mixed in use regardless of the type
of the external video signal source. Therefore, the conventional display apparatuses
have a problem in that the type of the external video signal source can not be precisely
determined to process the video signal properly with only the detected format of the
horizontal/vertical synchronous signals of the input video signal.
SUMMARY OF THE INVENTION
[0009] The present general inventive concept provides a display apparatus and a control
method thereof which precisely determines the type of an external video device and
properly processes a video signal from the determined external video device for higher
picture quality.
[0010] Additional aspects and advantages of the present general inventive concept will be
set forth in part in the description which follows and, in part, will be obvious from
the description, or may be learned by practice of the general inventive concept.
[0011] The foregoing and/or other aspects and utilities of the present general inventive
concept are achieved by providing a display apparatus comprising a display part on
which an image is displayed, comprising: a controller to determine whether a video
signal includes an authentication signal and to select a processing format of the
video signal input from an external video device based on the determination result;
and a signal processor to process the video signal corresponding to the processing
format selected by the controller.
[0012] The controller can comprise an authentication determiner to determine whether a video
signal supplied through a connector comprises an authentication signal
[0013] The controller can comprise a memory to store a plurality of video variables corresponding
to the processing format, and controls the signal processor to process the video signal
according to the plurality of video variables; and wherein the plurality of video
variables correspond with a computer signal and an authentication video signal, respectively.
[0014] The controller can control the signal processor to process the video signal as the
authentication video signal when the authentication determiner determines that the
authentication signal is received.
[0015] The controller can detect a timing signal of the video signal and selects the processing
format of the video signal according to the detection result.
[0016] The memory can store information on the timing signal corresponding to the processing
format, and wherein the controller can compare the timing signal of the detected video
signal with the information stored in the memory and determines the processing format
of the video signal.
[0017] The controller can detect the timing signal of the video signal and can determine
the processing format of the video signal when the authentication signal is not received.
[0018] The memory can store information on the timing signal corresponding to the computer
signal and the authentication video signal, respectively.
[0019] The timing signal can comprise at least one of a horizontal synchronous signal, a
vertical synchronous signal and a pixel clock signal of the video signal.
[0020] The controller can detect a data signal of the video signal and determines an output
format of the video signal based on the detected data signal.
[0021] The controller can detect a data signal of the video signal and can determine whether
to process the video signal corresponding to the computer signal or the authentication
video signal when the detected timing signal of the video signal is included in both
the information on the timing signal corresponding to the computer signal and the
information on the timing signal corresponding to the authentication video signal,
which are stored in the memory.
[0022] The controller can detect the data signal of the video signal and can determine whether
to process the video signal corresponding to the computer signal or the authentication
video signal when the information on the detected timing signal of the video signal
is not stored in the memory.
[0023] The authentication determiner can comprise a plurality of authentication IDs, and
wherein the authentication signal can comprise a signal having an instruction to output
the authentication IDs to the external video device according to a high-bandwidth
digital contents protection (HDCP) method.
[0024] The authentication determiner can comprise at least one of a digital video interface
(DVI) and a high definition multimedia interface(HDMI).
[0025] The foregoing and/or other aspects and utilities of the present general inventive
concept are achieved by providing a method of controlling a display apparatus, the
method comprising: determining whether an authentication signal is received from an
external video device; selecting a processing format of a video signal supplied from
the external video device according to whether the authentication signal is received;
and processing the video signal according to the selected processing format.
[0026] The determining the processing format of the video signal can comprise determining
the video signal as the computer signal when the authentication signal is not received.
[0027] The determining the processing format of the video signal can comprise determining
the video signal as the authentication video signal when the authentication signal
is received.
[0028] The method may further comprise detecting a timing signal of the video signal, and
wherein the determining the processing format of the video signal can comprise determining
the processing format of the video signal according to the detection result of the
timing signal.
[0029] The method may further comprise detecting a data signal of the video signal, and
wherein the determining the processing format of the video signal can comprise determining
the processing format of the video signal according to the detection result of the
data signal.
[0030] The method may further comprise providing a plurality of authentication IDs, and
wherein the determining whether the authentication signal is received can comprise
determining whether the authentication signal comprises a signal having an instruction
to output the authentication IDs to the external video device according to a high-bandwidth
digital contents protection (HDCP) method.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] These and/or other aspects and advantages of the present general inventive concept
will become apparent and more readily appreciated from the following description of
the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a control block diagram of a display apparatus according to an embodiment
of the present general inventive concept; and
FIG. 2 is a control flowchart illustrating an operation of the display apparatus according
of Fig. 1, according to an embodiment of the present general inventive concept.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0032] Reference will now be made in detail to the embodiments of the present general inventive
concept, examples of which are illustrated in the accompanying drawings, wherein like
reference numerals refer to the like elements throughout. The embodiments are described
below in order to explain the present general inventive concept by referring to the
figures.
[0033] As illustrated in FIG. 1, a display apparatus 100 according to an embodiment of the
present general inventive concept comprises a connector 10 which is connected with
an external video device 200, an authentication determiner 30, a signal processor
50, a display part 70, and a controller 90 which controls these components.
[0034] The connector 10 includes connection terminals through which the connector connects
with external video devices 200. Specifically, the connector 10 may include terminals
corresponding to various video signal formats to receive various video signals from
external video devices 200.
[0035] For example, the connector 10 may include at least one of a DVI (digital video interface)
input terminal (not illustrated) to receive a DVI signal, an HDMI (high definition
multimedia interface) input terminal (not illustrated) to receive a HDMI signal, a
composite input terminal (not illustrated) to receive a composite signal, an S-video
input terminal (not illustrated) to receive an S-video signal, a component input terminal
(not illustrated) to receive a component signal, and a PC input terminal (not illustrated)
to receive a PC signal.
[0036] The authentication determiner 30 determines whether an authentication signal is supplied
from the external video device 200 through the connector 10. In this embodiment, the
authentication determiner 30 may include an ID storage part 31 which has authentication
ID information, or the ID storage part 31 may output the authentication ID information
stored therein to the external video device 200 according to the authentication signal.
Thus, the external video device 200 may output the video signal to the display apparatus
100 after performing an authentication process based on the authentication ID information.
[0037] As an alternative embodiment, the authentication signal may include a plurality of
authentication key information for an authentication process, and the authentication
determiner 30 may proceed with the authentication process.
[0038] In this embodiment, if the display apparatus 100 supports high-bandwidth digital
contents protection (HDCP), the authentication determiner 30 may determine whether
the authentication signal according to the HDCP is received from the external video
device 200.
[0039] Specifically, if the external video device 200 supports the HDCP also, the external
video device 200 can read a pseudo random value (An) and an AKSV (key select vector
of a host device, i.e., the external video device 200) and transmit them to the display
apparatus 100. Upon receiving the An and the AKSV, the display apparatus 100 reads
an authentication ID stored in the ID storage part 31, i.e., a key select vector of
the display apparatus 100, and transmits the read authentication ID to the external
video device 200.
[0040] Here, the authentication signal may comprise a signal which has the An and the AKSV.
Thus, upon receiving a signal having the An and the AKSV, the authentication determiner
30 determines that an authentication signal is received, and then informs the controller
90 that the authentication signal is received. Then, the controller 90 of the display
apparatus 100 controls the signal processor 50 to process the video signal received
from the external video device 200 as an authenticated video signal.
[0041] In the meantime, upon receiving a BKSV (key select vector of the display apparatus),
the external video device 200 selects a plurality of AKSVs corresponding to the received
BKSV, among the stored plurality of AKSVs, and calculates a shared secret value (Km)
of the selected AKSVs. For example, the external video device 200 may sum the selected
AKSVs to calculate Km (the shared secret value of the selected AKSVs). The external
video device 200 calculates a session key (Ks), a secret value (Mo) and a response
value (Ro) by using An and Km as a factor of a high-bandwidth digital contents protection
(HDCP) cipher function. With the same method, "Ro'" calculated by the display apparatus
100 may be supplied to the external video device 200.
[0042] Then, the external video device 200 may determine whether the HDCP authentication
is successful by using "Ro" calculated by the external video device 200 and "Ro'"
calculate and responded by the display apparatus 100. For example, if "Ro" and "Ro'"
are identical with each other, the external video device 200 may determine that the
HDCP authentication is successful. When the authentication is determined to be successful,
the external video device 200 may output the video signal to the display apparatus
100.
[0043] In this embodiment, the authentication determiner 30 may include various interfaces
such as a DVI interface, an HDMI interface and the like, as long as it can determine
whether the authentication signal is received.
[0044] The signal processor 50 processes the video signal received from the connector 10
to be displayed on the display part 70. If a plurality of connectors 10 are provided
in the display apparatus 100, the signal processor 50 may process the video signal
which is input through a connector 10 selected among the plurality of connectors 10,
to be displayed on the display part 70.
[0045] In this embodiment, the signal processor 50 may include a scaler (not illustrated)
to scale the video signal, an A/D converter (not illustrated) to convert an input
analog signal into a digital signal, etc. Using these components, the signal processor
50 may process the video signal input from the external video device 200 to be displayed
on the display part 70 in more various ways.
[0046] Also, the signal processor 50 may differentially process the video signal according
to the type of the external video device 200 under a control of the controller 90
(to be described later).
[0047] The display part 70 receives the video signal from the signal processor 50 and displays
an image. The display part 70 can include a display module (not illustrated) on which
the image is displayed, and a module driver (not illustrated) which processes an input
video signal and displays the image on the display module.
[0048] In this embodiment, the display module may include various types of display modules,
such as a cathode ray tube (CRT), a digital light processing (DLP), a liquid crystal
display (LCD) and a plasma display panel (PDP). If the display module is the DLP,
the module driver includes an optical engine. If the display module is the LCD, the
module driver includes a printed circuit board (PCB) which converts the video signal
input from the signal processor 50 into a data signal and a gate signal. In this manner,
the display part 70 may have different module drivers depending on the type of the
display module.
[0049] The controller 90 analyses the video signal supplied from the external video device
200 and determines a processing format of the video signal. Then, the controller 90
controls the signal processor 50 to process the video signal according to the determined
processing format.
[0050] Hereinafter, it will be illustrated in this embodiment that the processing formats
include a processing format corresponding to a PC signal and a processing format corresponding
to an authentication video signal. Here, the PC signal comprises a signal supplied
from a PC. An external video signal comprises a signal supplied from a video source,
such as, for example, a DVD player, but not the PC.
[0051] The controller 90 analyzes the video signal from the external video device 200, determines
the processing format of the video signal corresponding to the PC signal or the authentication
video signal, and controls the signal processor 50 to process the video signal according
to the determined processing format.
[0052] In this embodiment, the controller 90 may control the signal processor 50 to process
the video signal as the authentication video signal when the authentication signal
is received based on the determination result of the authentication determiner 30.
As described above, when the display apparatus 100 supports the HDCP, the authentication
signal comprises a signal having an An and an AKSV. However, the authentication signal
may be any signal if only it may be used for the authentication process.
[0053] When the authentication signal is not received, the controller 90 may process the
video signal from the external video device 200 as the PC signal. In this case, the
controller 90 may detect at least one of a timing signal and a data signal of the
video signal to determine the output format of the video signal.
[0054] In an embodiment, the controller 90 may include a memory 91 to store video variables
corresponding to respective processing formats. That is, the memory 91 may store a
video variable corresponding to the PC signal and a video variable corresponding to
the authentication video signal. Thus, the controller 90 can control the signal processor
50 to process the video signal according to the video variables stored in the memory
91. Here, the respective video variables may include various factors such as picture
quality, image size and the like.
[0055] Here, the controller 90 may determine that the video signal to be processed as the
PC signal is a video signal received from a PC, and store a video variable that is
suitable to process the video signal received from the PC in the memory 91. Also,
the controller 90 may determine that the video signal to be processed as the authentication
signal is a video signal received from a video device such a DVD or a HDMI, and store
a video variable that is suitable to process the video signal in the memory 91.
[0056] As there is a high possibility that an image corresponding to the PC signal comprises
a still image, the controller 90 may control the signal processor 50 to process the
image corresponding to the PC signal to be compatible with the still image, and to
process an image corresponding to the authentication video signal to be compatible
with a moving picture. The controller 90 may control the signal processor 50 to process
the PC signal to be displayed with an overall display picture since the PC signal
includes information on a task bar, and to process the authentication video signal
with high image quality.
[0057] Meanwhile, the controller 90 may detect the timing signal of the video signal and
determine an output format of the video signal according to a detection result. That
is, the controller 90 may control the signal processor 50 to process the video signal
supplied from an external source corresponding to one of the PC signal and the authentication
video signal, according to the detected timing signal. Here, the timing signal comprises
at least one of timing signals of a pixel clock signal and horizontal/vertical synchronous
signals.
[0058] The memory 91 may further store information on the timing signal corresponding to
the PC signal and information on the timing signal corresponding to the authentication
video signal. Accordingly, the controller 90 may compare the timing signal of the
detected video signal with the information stored in the memory 91 to determine the
video signal. That is, the controller 90 may determine whether the video signal corresponds
to the PC signal or the authentication video signal.
[0059] For example, the memory 91 may store a timing signal of "1024X768/60Hz" corresponding
to the PC signal. Here, the timing signal of the vertical synchronous signal has a
frequency of 60Hz, the timing signal of the horizontal synchronous signal has a frequency
of 60X768Hz, and the timing signal of the pixel clock signal has a frequency of "60X768X1024Hz."
Also, the memory 91 may store a timing signal of "1280X768/60Hz" corresponding to
the authentication video signal. In this case, the timing signal of the vertical synchronous
signal has a frequency of 60Hz, the timing signal of the horizontal synchronous signal
has a frequency of 60X768Hz, and the timing signal of the pixel clock signal has a
frequency of 60X768X1024Hz.
[0060] Upon receiving a video signal corresponding to the frequency of "1280X768/60Hz,"
the controller 90 may process the video signal as the authentication video signal.
Upon receiving a video signal corresponding to the frequency of "1024X768/60Hz," the
controller 90 may process the video signal as the PC signal.
[0061] As described above, the controller 90 first determines whether the authentication
signal is received, and then detects the timing signal of the video signal if it is
determined that the authentication signal is not received. The controller 90 may determine
whether to process the video signal as the PC signal or as the authentication video
signal, based on the detection result.
[0062] Meanwhile, the controller 90 may detect a data signal of the video signal and determine
whether to process the video signal corresponding to the PC signal or the authentication
video signal based on the detected data signal. Here, the memory 91 stores information
corresponding to the data size of the PC signal and information corresponding to the
data size of the authentication video signal.
[0063] Then, the controller 90 compares the data size of the detected data signal with the
data size stored in the memory 91 to determine whether to process the input video
signal as the PC signal or as the authentication video signal.
[0064] Here, after detecting the timing signal of the video signal, the controller 90 may
detect the data signal of the video signal when it does not determine whether the
video signal corresponds to the PC signal or the authentication video signal based
on the comparison of the detection result with the information on the timing signal
stored in the memory 91.
[0065] When the timing signal of the video signal does not correspond to either the timing
signal corresponding to the PC signal stored in the memory 91 or the timing signal
corresponding to the authentication video signal, the controller 90 may not determine
whether the video signal corresponds to the PC signal or the authentication video
signal. When the information stored as the PC signal and the information stored as
the authentication video signal in the memory 91 comprise the same timing signal,
the controller 90 may not determine whether the video signal corresponds to the PC
signal or the authentication video signal.
[0066] For example, when both the information stored as the PC signal and the information
as the authentication video signal in the memory 91 have a frequency of "1024X768/60Hz,"
the received video signal may correspond to "the frequency of 1024X768/60Hz." Then,
the controller 90 may not determine whether the video signal corresponds to the PC
signal or the authentication video signal. Thus, the controller 90 may detect the
data signal of the video signal input through the connector 10 to determine whether
the input video signal corresponds to the PC signal or the authentication video signal.
[0067] Hereinafter, a control method of the display apparatus of FIG. 1 will be described
with reference to FIG. 2.
[0068] As illustrated in FIG. 2 and referenced to FIG. 1, the display apparatus 100 is connected
with the external video device 200 through the connector 10 at operation S11 to receive
a video signal from the external video device 200. Then, the authentication determiner
30 of the display apparatus 100 determines whether an authentication signal is received
from the external video device 200 at operation S13. Since the authentication signal
has been described above with reference to FIG. 1, a detailed explanation thereof
will be omitted here.
[0069] If it is determined at the operation S13 that the authentication signal is received,
the controller 90 controls the signal processor 50 to process the video signal as
a video variable corresponding to the authentication video signal at operation S27.
If it is determined at the operation S13 that the authentication signal is not received,
the controller 90 may detect a timing signal of the video signal at operation S15.
Here, the timing signal comprises at least one of a pixel clock signal, a horizontal
synchronous signal and a vertical synchronous signal.
[0070] The controller 90 determines whether the detected timing signal corresponds to a
PC signal or the authentication video signal at operations S17 and S19. It is preferable,
but not necessary, that the memory 91 stores information on the timing signal corresponding
to the PC signal and information on the timing signal corresponding to the authentication
video signal.
[0071] If it is determined at the operation S17 that the detected timing signal corresponds
to the PC signal, the controller 90 controls the signal processor 50 to process the
video signal as the video variable corresponding to the PC signal at operation S25.
If it is determined at the operation S19 that the detected timing signal corresponds
to the authentication video signal, the controller 90 controls the signal processor
50 to process the video signal as the video variable corresponding to the authentication
video signal at operation S27.
[0072] Meanwhile, the controller 90 may not determine whether the video signal corresponds
to the PC signal or the authentication video signal, even after detecting the timing
signal of the video signal and comparing the detected timing signal with the information
stored in the memory 91. As described above, such a case may arise when the information
corresponding to the timing signal of the input video signal is not stored in the
memory 91 or when the timing signal of the input video signal is stored in the memory
91 to correspond to both of the PC signal and the authentication video signal.
[0073] Then, the controller 90 detects the data size of a data signal of the video signal
at operation S21. Next, the controller 90 determines whether the data size of the
detected data signal corresponds to the PC signal or the authentication video signal
at operation S23. Here, it is preferable, but not necessary, that the memory 91 of
the controller 90 stores the information on the data size of the data signal corresponding
to the PC signal and the data size of the data signal corresponding to the authentication
video signal. In this case, the controller 90 may compare the data size of the data
signal of the video signal supplied from the external video device 200 with the information
stored in the memory 91 to determine whether the input video signal corresponds to
the PC signal or the authentication video signal.
[0074] If the data size of the data signal of the video signal corresponds to the authentication
video signal, the controller 90 controls the signal processor 50 to process the video
signal as the video variable corresponding to the authentication video signal, according
to the data size of the data signal of the video signal at the operation S27. If the
data size of the data signal of the video signal corresponds to the PC signal, the
controller 90 may control the signal processor 50 to process the video signal as the
video variable corresponding to the PC signal, according to the data size of the data
signal of the video signal at the operation S25.
[0075] While it has been illustrated In the foregoing embodiments that the display apparatus
100 determines whether an authentication signal is received from the external video
device 200 and then detects a timing signal, the operations of determining the reception
of the authentication signal to distinguish between video signals, detecting the timing
signal to distinguish between video signals, and detecting the data signal to distinguish
between video signals may be modified and changed by an intention of a manufacturer
of the display apparatus 100 according to the present general inventive concept.
[0076] As apparent from the above description, the present general inventive concept provides
a display apparatus and a control method thereof, which precisely determines the type
of an external video device and properly processes a video signal from the external
video device for better image quality.
[0077] Although a few embodiments of the present general inventive concept have been shown
and described, it will be appreciated by those skilled in the art that changes may
be made in these embodiments without departing from the principles and spirit of the
general inventive concept, the scope of which is defined in the appended claims and
their equivalents.
1. A display apparatus comprising a display part on which an image is displayed, comprising:
a controller to determine whether a video signal includes an authentication signal
and to select a processing format of the video signal input from an external video
device based on the determination result; and
a signal processor to process the video signal corresponding to the processing format
selected by the controller.
2. The display apparatus according to claim 1, wherein the controller comprises an authentication
determiner to determine whether a video signal supplied through a connector comprises
an authentication signal.
3. The display apparatus according to claim 1 or 2, wherein the controller comprises
a memory to store a plurality of video variables corresponding to the processing format,
and controls the signal processor to process the video signal according to the plurality
of video variables; and
wherein the plurality of video variables correspond with a computer signal and an
authentication video signal, respectively.
4. The display apparatus according to claim 3, wherein the controller controls the signal
processor to process the video signal as the authentication video signal when the
authentication determiner determines that the authentication signal is received.
5. The display apparatus according to claim 3 or 4, wherein the controller detects a
timing signal of the video signal and selects the processing format of the video signal
according to the detection result.
6. The display apparatus according to claim 5, wherein the memory stores information
on the timing signal corresponding to the processing format, and
wherein the controller compares the timing signal of the detected video signal with
the information stored in the memory and determines the processing format of the video
signal.
7. The display apparatus according to claim 6, wherein the controller detects the timing
signal of the video signal and determines the processing format of the video signal
when the authentication signal is not received.
8. The display apparatus according to any of the claims 5-7, wherein the memory stores
information on the timing signal corresponding to the computer signal and the authentication
video signal, respectively.
9. The display apparatus according to any of the claims 5-8, wherein the timing signal
comprises at least one of a horizontal synchronous signal, a vertical synchronous
signal and a pixel clock signal of the video signal.
10. The display apparatus according to any of the claims 3-9, wherein the controller detects
a data signal of the video signal and determines an output format of the video signal
based on the detected data signal.
11. The display apparatus according to any of the claims 6-8, wherein the controller detects
a data signal of the video signal and determines whether to process the video signal
corresponding to the computer signal or the authentication video signal when the detected
timing signal of the video signal is included in both the information on the timing
signal corresponding to the computer signal and the information on the timing signal
corresponding to the authentication video signal, which are stored in the memory.
12. The display apparatus according to any of the claims 6-8, wherein the controller detects
the data signal of the video signal and determines whether to process the video signal
corresponding to the computer signal or the authentication video signal when the information
on the detected timing signal of the video signal is not stored in the memory.
13. The display apparatus according to any of the claims 1-12, wherein the authentication
determiner comprises a plurality of authentication IDs, and
wherein the authentication signal comprises a signal having an instruction to output
the authentication IDs to the external video device according to a high-bandwidth
digital contents protection (HDCP) method.
14. The display apparatus according to claim 13, wherein the authentication determiner
comprises at least one of a digital video interface (DVI) and a high definition multimedia
interface (HDMI).
15. A method of controlling a display apparatus, the method comprising:
determining whether an authentication signal is received from an external video device;
selecting a processing format of a video signal supplied from the external video device
according to whether the authentication signal is received; and
processing the video signal according to the selected processing format.
16. The method according to claim 15, wherein the determining the processing format of
the video signal comprises:
determining the video signal as the computer signal when the authentication signal
is not received.
17. The method according to any of the claims 15 or 16, wherein the determining the processing
format of the video signal comprises:
determining the video signal as the authentication video signal when the authentication
signal is received.
18. The method according to any of the claims 15-17, further comprising:
detecting a timing signal of the video signal, and
wherein the determining the processing format of the video signal comprises determining
the processing format of the video signal according to the detection result of the
timing signal.
19. The method according to claim 18, further comprising:
detecting a data signal of the video signal, and
wherein the determining the processing format of the video signal comprises determining
the processing format of the video signal according to the detection result of the
data signal.
20. The method according to any of the claims 15-19, further comprising:
providing a plurality of authentication IDs, and
wherein the determining whether the authentication signal is received comprises determining
whether the authentication signal comprises a signal having an instruction to output
the authentication IDs to the external video device according to a high-bandwidth
digital contents protection (HDCP) method.